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Uses two-dimensional "sprites", 2D images created and used on a flat plane, as opposed to the three-dimensional models or environments found in 3D games.

Featuring aesthetics, gameplay, or themes reminiscent of classic video games. Often characterized by pixel art, chiptune music, or mechanics popularized in earlier gaming eras.

Near infinitely replayable games that usually feature, random generation, perma-death, and brutal difficulty. 

Unity is a game engine for 2D, 3D, AR and more